Deadman wrote:Oh sorry, I meant the endgame screen, like just after you die in a dungeon (even if I'm not carrying any extra gear in)

That's strange... Is it greyed out at all? The game will automatically try to prevent you from restarting a run in which you advance a quest or unlock something like a new badge. Although generally if you die there are only a few quests that still complete and they're mostly tied to gods.

We took a look at your savegame, there was nothing in it on our side that seemed to cause problems with the restart button... You can't restart a run that you've won, but I doubt that was the problem Can you reproduce the problem?